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Topic: how to find motor ratings (Read 2272 times)

I just have finished my first line following robot circuitry and now facing one problem that I don't know what are the ratings of the motors I have ( I have it from china made toys just like this DC MOTOR shown on http://www.societyofrobots.com/actuators.shtml )

I also tried the bulky audio cassette player motors thinking it of having better torque but it is not enough to move the robot. When I connect those toy motors everything just stops and if I connect some resistors in series with those motors they work but very slow and defiantly can not carry the load of robot. Don't know what to do ? I tried different values of resistors in series but nothing works fine PLEASE HELP ME !!

Can't help much more if you don't have the motor part numbers or at least where they came from. Sometimes looking up the device from where they were lifted from can help finding out which motors the original manufacturer used.

Here it is I tried removing LEDs connected to MCU and also put higher value resistance in series with LED between LDRS, but it did'nt work !! Can connecting LEDs directly create problem ? ..................................Oh ! no ! now it gives just 50mA !!!!!!, don't know what happen

Note that the pins of MCU which are connected with LEDs ( in alternate polarity ) are input pins for L293D, and the LEDs are to indicate that at least digital part is running well, I have tried the ckt removing these LEDs but didn't work and this disaster happen ( JUST 50mA )